package com.bdqn.vueboot.service;

import com.bdqn.vueboot.entity.User;
import com.bdqn.vueboot.repository.UserRepository;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;

@Service(value = "userServiceImp")
public class UserServiceImp implements UserService {

    @Resource
    UserRepository userRepository;

    @Override
    public User findByUserNameBiz(String uname) {
        return userRepository.findUserByUsrName(uname);
    }

    @Override
    public Page<User> findPageByMap(Map param, Pageable pageable) {
        return userRepository.findAll(new Specification<User>() {
            @Override
            public Predicate toPredicate(Root<User> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
                List<Predicate> predicates = new ArrayList<>();
                if (param.get("usrName") != null && !param.get("usrName").equals("")) {
                    predicates.add(criteriaBuilder.like(root.get("usrName"), "%" + param.get("usrName") + "%"));
                }
                return criteriaBuilder.and(predicates.toArray(new Predicate[predicates.size()]));
            }
        }, pageable);
    }

    @Override
    public void saveUser(User user) throws Exception {
        userRepository.save(user);
    }

    public void deleteByUserId(Long id) throws Exception {
        userRepository.deleteById(id);
    }

    public User findByUserIdBiz(Long id) throws Exception {
        User user = null;
        if (userRepository.findById(id).isPresent()) {
            user = userRepository.findById(id).get();
        }
        return user;
    }


}
